Log Transformation

from google.colab.patches import cv2_imshow
import cv2
from matplotlib import pyplot as plt

img = cv2.imread('sir.jpg', 0)
cv2_imshow(img)

import numpy as np
c = 255 / np.log(1 + np.max(img))
log_image = c * (np.log(img + 1))
log_image = np.array(log_image, dtype = np.uint8)
cv2_imshow(log_image)